*{
	padding: 0;
	margin: 0;
}
.back{
	width: 100%;
	height: 1000px;
	background-image: url(../3.jpg);
	background-repeat: no-repeat;
	background-position-x:center;
	background-position-y:13%;
	font-size: 40px;
	color: #fff;
	background-size:100% 945px;
	
}
.flex-container {
    display: -webkit-flex;
    display: flex;
}

.flex-item {
    background-color: #000;
    width: 33%;
    height: 300px;
    margin: 10px;
}
